Abstract
Cryogenic and large-base Fabry-Perot cavities for ultra-stable laser systems
Highlights
Nowadays most of high-precision spectroscopy experiments are based on lasers with spectral linewidth less than 1 Hz
The idea of lowering temperature with stabilization at the point of zero extension is presented by two cryogenic single-crystal silicon cavities – one with dielectric SiO2/Ta2O5 mirrors (1) and one with crystalline GaAs/AlGaAs mirrors (2)
Silicon is a very promising material for upcoming ultra-stable cavities because it has a temperature of zero extension at
Summary
Nowadays most of high-precision spectroscopy experiments are based on lasers with spectral linewidth less than 1 Hz. Basic technique to obtain ultra-low fractional instability is locking laser frequency to the mode of a passive monolith ultra-stable high-finesse Fabry-Perot cavity. It has to be vibroisolated and thermostabilized, is usually kept in ultra-high vacuum. Under those conditions fractional instability is fundamentally limited by thermal noise of cavity’s mirrors
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